1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeac75ff10edfdf7d4313e8c5a0d6cbaf13147c3ffb94e42db7292a88ec89c0b6. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b768cb32-a738-4013-b7ee-257a07b16caa.json and https://artists.proofprofile.net/proofs/artist/b768cb32-a738-4013-b7ee-257a07b16caa.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x854203cd8aef00cc70713d9753fe396c2c172b1e2232c69fdc82bcf17257249e. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES6081243101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ba9e7a7cc904e4653118df05dd945ddee25b7cb4f173cd49669113bfb690883. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES6081243103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e462d05354f413bb77d73fd6d407fe36022e90ee6f00e300794ad86d2991208. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES6081641107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe1fdb2f01138834efe2d0732b1cf07875d1e6ebe47eb6b5272458d4a9f7552f. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCABN1349153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2be6cf25d0763a273a69df51b57980d87cb5b1d636e91ed3ce3a42d5c61f8090. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES71G1309387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83b806c824f4abadaf1f7c3f14975c2053723c52750831cd55ff7bc6f1db6be7. Chain 2 (Bitcoin): anchored in block 960161 (2026-07-29T22:51:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES71G1512048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bc789e20a3111c1472980ba87daf2b2886da7e9a37205d79a0b5354a2683929. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES6080780708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe5782837d1df41ec68490507fa8ca7cc5febfa5854c7e6424a58d58ed5e1ad6. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES6081840207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf701767f340fdeadce9eee95a7f1b7cb47990f94bab250779e12264aa9d7dab2. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES71G1704209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24944d61ad1f49716bc513416e81685fbd578845fecb22d94c23b39db638521d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ESAAI0190342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5929762ce8036c3f4717b9c6ba1711cdce43d26d82db3d3a684e4651cdb9df8a. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES6081142714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3299b1027cdbcb8cdfc6b06af4cd8c5a821129aabb218b2c665f8c53d442f258. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDY41829595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4876bc01d9f8b6daa03597cacdf0aa1287d0b4f0753a2da5f4e92cfa8dcf7755. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES6081340102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7493de05b2a8f79ce1e286d56a2b51eaff584a76b02c66c0b478d4c7b573edf. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES6081340107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fc142811a4280844f9ecde11a5473f9342fa05f64bb9a6232fa6e50b3524c07. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES6081941305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd47f48b79007760ec2dc237e8889ad5a9261f5fc5bee9a94c6cc3f22363b0ec8. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES6081142704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe272895f4f1861f2310aaf97efba422b811669bc093e6ef125e4839fbdf11203. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM82431863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d6923711a50f6718282d74e9b83773e872d715c59291ff37653c0dee6e019bb. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ESAAI0187552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93a94475944b7a70d16a1600e33c0674cb1732410a8223a96c3982af5e04e784. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ESA011402516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fc142811a4280844f9ecde11a5473f9342fa05f64bb9a6232fa6e50b3524c07. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES6081941305.